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Reference · stzMatrix

ReplaceRow()

Replace a specific row

Basic examples (2)

Softanza
oM = new stzMatrix([ [1,2], [3,4] ])
# the determinant is right to begin with
? oM.Determinant()
oM.ReplaceRow(1, [99, 2])
# the content shows the change
? @@(oM.Content())
# and the ENGINE agrees: 99*4 - 2*3
? oM.Determinant()
Output
-2
[ [ 99, 2 ], [ 3, 4 ] ]
390

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from numeric_matrix_truth_narrated.ring(opens in a new tab)

Softanza
oRow = new stzMatrix([ [1,2], [3,4] ])
nWarm = oRow.Determinant()
oRow.ReplaceRow(1, [99, 2])
# ReplaceRow
? oRow.Determinant()
oCol = new stzMatrix([ [1,2], [3,4] ])
nWarm = oCol.Determinant()
oCol.ReplaceCol(1, [99, 3])
# ReplaceCol
? oCol.Determinant()
oAt = new stzMatrix([ [1,2], [3,4] ])
nWarm = oAt.Determinant()
oAt.ReplaceElementAt([1, 1], 99)
# ReplaceElementAt
? oAt.Determinant()
oEl = new stzMatrix([ [1,2], [3,4] ])
nWarm = oEl.Determinant()
oEl.ReplaceElement(1, 99)
# ReplaceElement
? oEl.Determinant()
Output
390
390
390
390

run on 2026-10-02 04:23 inside the library at commit 0e72e2e2c; taken from numeric_matrix_truth_narrated.ring(opens in a new tab)

The extensions of this method

Each extension, and whether it exists for this method; an extension that exists combines with the others (FindSTCS).

Extension
Exists
What it adds · The names
Q
no
does what the method does, then returns the object, so the call can be chained
QQ
no
chains on the next, more specific type of object (the Q ladder)
QQQ
no
chains on the most specific type of object (the Q ladder)
QRT
no
returns the result as an object of the requested type
CS
no
takes a case-sensitivity flag
ST
no
takes the position to start from (StartingAt)
IB
no
takes bounds that are included (IncludingBounds)
XT
no
the extended form: more parameters than the base method
XTT
no
yet another extension: a further extended form, after XT
Z
no
includes the position in what it returns
ZZ
no
returns positions as sections, [start, end]
W
no
selects by a condition
WF
no
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...)
D
no
takes a direction, forward or backward (Directional)
F
no
takes a function (the condition or the update is given as a function); the forms document also uses F for the future form, which defers the action
Many
no
works on a collection of items instead of one (the plural form)
Except
no
takes exceptions, what to leave out (the exceptional form)
U
no
returns the result without duplication

Every example is a test file of the library, run inside the library for this page; only those whose output kept every promise their file wrote are shown.

See also